import { Lexeme } from '../models/Lexeme';
/**
 * Class responsible for tokenizing SQL input.
 */
export declare class SqlTokenizer {
    /**
     * The input SQL string to be tokenized.
     */
    private input;
    /**
     * Current position within the input string.
     */
    private position;
    /**
     * Manager responsible for handling token readers.
     */
    private readerManager;
    /**
     * Initializes a new instance of the SqlTokenizer.
     */
    constructor(input: string);
    /**
     * Checks if the end of input is reached.
     *
     * @param shift - The shift to consider beyond the current position.
     * @returns True if the end of input is reached; otherwise, false.
     */
    private isEndOfInput;
    /**
     * Checks if more input can be read.
     *
     * @param shift - The shift to consider beyond the current position.
     * @returns True if more input can be read; otherwise, false.
     */
    private canRead;
    /**
     * Reads the lexemes from the input string.
     *
     * @returns An array of lexemes extracted from the input string.
     * @throws Error if an unexpected character is encountered.
     */
    readLexmes(): Lexeme[];
    /**
     * Adds pending comments to the last token.
     */
    private addPendingCommentsToLastToken;
    /**
     * Adds comments to the token.
     */
    private addCommentsToToken;
    /**
     * Skips whitespace characters and SQL comments in the input.
     *
     * @remarks This method updates the position pointer.
     */
    private readComment;
    /**
     * Gets debug information for error reporting.
     *
     * @param errPosition - The position where the error occurred.
     * @returns A string containing the debug position information.
     */
    private getDebugPositionInfo;
}